Extend disk /dev/sdb on `dashboards-com-01-inf-ops` to 150G

Production Change - Criticality 2 C2

Change Objective	Describe the objective of the change
Change Type	Extend disk /dev/sdb on `dashboards-com-01-inf-ops` to 150G
Services Impacted	~"Service:Dashboards"
Change Team Members	@T4cC0re
Change Severity	~S2
Buddy check	A colleague will review the change
Tested in staging	N/A
Schedule of the change	2019-05-27 14:30 UTC
Duration of the change	No rollback
Detailed steps for the change. Each step must include:	- pre-conditions for execution of the step, - execution commands for the step, - post-execution validation for the step , - rollback of the step